The strategy document, to be sent to 1,000 homes and business to gather comments, coincides with a two-month search by Plaid to pinpoint why there is shortage of affordable homes in Wales.

Caernarfon MP Hywel Williams said: "Labour's Assembly government is fiddling around the edges of the housing problem and ignoring the affordability crisis.

"Meanwhile, ordinary people trying to set up a home in Wales in the 21st century are prevented from doing so.

"Between 1997 and 2004, house prices rose 124%, against a backdrop of near stagnant wealth, especially in some rural areas in Wales where earnings are actually falling."

Among Plaid's radical measures are an overhaul of the stamp duty system, encouraging banks and building societies to offer shared equity mortgages, plus setting up an Assembly community land trust unit.

Under Plaid's proposals a family buying an average home in Wales would save £1,400. People buying second homes could be charged more than £11,000 in stamp duty.

Former Plaid Cymru MEP and parliamentary candidate in Ynys Mon, Eurig Wyn, said: "Our proposals are not a wish list. Rather, they are measures that could reasonably be implemented by the Assembly and Westminster governments and by housing mortgage providers to bring homes within reach of ordinary people.

"Here in Anglesey we have witnessed some of the highest price rises in the whole of the UK and people, especially young families, are becoming increasingly desperate."